I Would Like To Receive A Official Document From Lufthansa Airline Stating That

I would like to receive a official document from  Lufthansa airline stating that I don’t want  to use a credit  for two tickets scheduled for Sep 4 2012 , fight #  LH 1451 originating  from Moscow  as well as for two tickets flight #  LH 438 originating  from Frankfurt. Me and my son were not able to use that tickets due to his injury on August 29. As  a result we had to use  Aeroflot to fly to US on Aug 30. I need a official statement from you  so  I can submit it to a insurance company to be reimbursed properly . Again : please provide me with official document stating that I don’t have any credit with you ,and  I don’t want to use any credits in the future . Sincerely M.Cherkassky.M.D. Please contact me if you need any  additional information .